Drag scraper



Nov. 27, 1928. 1,693,353

' mentor,

wm -1 f5/Wy! Patented Nov. 27, 1928..

UNITED STATES WILLIAM J. SLAVIN, F HOWELL, MICHIGAN.

DRAG SCRAPER.

Application filed February 23, 1926 Serial No. 89,960. l

This invention relates to drag scrapers such as are used for the grading of ground or similar excavating purposes, and has for its object to provide a device simple in both operation and construction, which will be readily freed from the load upon dumping at the end of a scraping or excavating movement in a positive manner without regard to any special effort on the part of the operator to insure such freeing.

A further object of the said invention is to provide load-freeing means in such a drag scraper Which will be automatically operable upon the operation of the cables effecting the movement of the scraper to release the said scraper from the load prior to its being dragged back from the position which it oc` cupies at the end of its` scraping movement, whereby the necessity for additional cables or releasing means for effectinfr the operation of the load-freeing means is obviated.

The invention further contemplates the provision of a drag scraper body in the form of an inverted channel structure open at both ends and having a scraper hingedly attached to the rear portion thereof so that it may be lifted and lowered from and into contact with t-he work, said scraper being provided with means at its lower end for the attachment of cables thereto extending forwardly and rearwardly thereof for the movement of the device forwardly or rearwardly, the rearwardly extending cable being intended to pass through a suitably disposed tail block and the upper end of the scraper being provided with a sheave through which said cable is adapted to be returned and whichris adapted to raise or assist in-the raising of said scraper when the return cable is tensioned for the return movement of the device after a scraping operation, whereby, prior to such return moveg ment, the load is freed fromV the scraper by such raising and Vby the opening of the rear end of the device, due to the raising of the scraper, so that obstruction to the rearward or return movement of the said device, is minimized. j

vStill further objects subsidiary to or resulting from the aforesaid objects, or from the construction or operation of the invention as it may be carried into effect, will become apparent as Ythe said invention is hereinafter further disclosed.

In carrying the said invention into effect, I may provide a drag scraper having a body portion of inverted channel formation, the lower edges of the depending sides of whichv act as runners, with a scraper proper in the form of a gate hingedly mounted over the rear end of the said body portion, and in operative position closing Y having lateral arms extending over the sides of the body and pivoted thereon; a cable extending forwardly from the lower part of the scraper through suitable guides at the forward end of the body, and a further cable extending in the opposite direction from the lower part of the scraper, a sheave being provided at the upper end of the scraper where? by said last mentioned cable may be extended rearwardly to and over a suitably mounted tail block and thence through said sheave, the two cables being connected to a double drum hoist so that either of them may be operated to effect the movement of the drag scraper upwardly or rearwardly.

All of which is more particularly described and ascertained hereinafter, by Way of example, having reference to the accompanying drawing, wherein Y Figure 1 is a side elevation of a drag scraper embodying the said invention, in a closed position;

Figure 2 is a similar view illustrating the drag scraper'in an open position;

Figure 3 is a plan of the closed drag scraper;

Figure 4 illustrates in elevation, my improved drag scraper in use, performing a scraping operation;

Figure 5 is a similar view to Figure 4, illustrating the parts in a different position;

F igurey 6 is a front elevationof the scraper in operative position Figure 7 Vis a fragmentary side elevation of a modified form of the same; and

F igure 8 is a fragmentary plan of underside of said modified form. f

Similar characters of reference indicate similar parts in the several figures of thedrawings.

l indicates a drag scraper body of inverted channel formation having side members 2, the lower edges of which act as runners over the material being excavated, the said body being open at the front and rear ends, but the rear end being provided with a closure in the form of-a gate 3, the lower edge of which is in the form of a scraper proper 3, provided with side members 4 overlapping. the sides 2 the same, said scraper lze of the body and pivoted thereon at 5 to provide for an upward swinging movement of the said gate 3.

The upper part of the said gate 3 is provided with a sheave 6 including a pulley 7 and the lower part of the gate'with shackles 8 which may be pivotally mounted as at 9. Mounted at the forward end of the body are eyes in the forni of U-bolts lOthrough which cables 11 extend forwardly from the shackles 8 to a ring 11n, and 12 are further cables extending rearwardly from the said shackles to a ring 12a. Y

In use, a cable'l is passed from the ring 121L through a tai1 block la' suitably secured to av supportV 15 to the rear of the worlrand thence the vcable 13 eilt-ends forwardly through thesheave 6 to the upper drum 16 Vof atwodruin hoist 17, the lower drum 18 of which receives a cable 19 extending from the ring 11a. Thus the drag scraper niay be moved forwardly or'rearwardly over the work according to the direction of operation of the said drums. l

The, height of the tail block tially above the shackles 8 and preferal'ily abovethe pivots 5, and' the relation of the said tail block and the drinn 16 of the hoist is such that normally the sheave 6 is substanjtially below a plane extending between the' said. sheave block and the point of contact of the cable 13 with the said druni, so that upon the tensioning of thesaid Vcable 13 Vthe gate 3 will be raised Vboth by the upward pull of the cable onthe shackles and the upward lifting of the pulley 7 bythe straightening of the said cable between the drinn 16 and the tail block.

This upward lifting of the gate 3 results in the unclosing of the open rear end of the body of the device as is clearly illustrated inl VFigure 2 of the drawing. This condition exists when the cable 13 is operated for the dragging of the device rearwardly over the work after a scraping operation has been completed, 'and as soon as the cable is slackened to permit the forward movement ofl the device, the support of the gate is relieved so that it again falls into operative position relative to the ground or work, and the tension on the cable 19, results ,from the operation of the druin 18 to effect the forward 14e is substan- 'material bacli with it as it nieves rearwardly,

and where the material is ordinarily inclined to clog the device, such as in the case of clay, this is of decided benefit andgreatly increase the efficiency of the drag scraper.

.lt will be readily apparent that no attention on the part of the operator is required to insure this freeing action after each operation of the scraper, and that such freeing action is entirely automatic without introducing any further Vcables `or coi'nplicated mechanism beyond that required forthe' actual'uioveinent of the drag Ascraper itselff ln Figures 'l and 5 the said walls 2 of the body of the Vscraper are indicated' having a blade 2O transversely mounted thereinA which inay effect the actual excavating, in which case the scraper3a4 may perform an auxiliary scraping function thereto, or the gate may siinply act as a means of confining the material within the body 'during the for- 1ward movement of device. t i

This invention inay be developed Vwithin t e scopeof the following' claimV without departing froin the essential features of the said invention, and itf is des y tion and drawing beV read asinerely illustra tive and not in a limiting sense, except as necessitatedby the prior art.' y Y l/Vhat I claim is :e e y A drag scraper comprising a hollow body open at the frontend rear ends, closure gate for the rear end of said body hingedly connected theretoand upwardly swingable, cables attachedto the flower part of said gate' and extending -in opposite directions therefrom, a pulley carried by theupoer part of said gate, one of said cables being also passed beneathsaid pulley. Y

ln testimony whereof I ailii'r iny signature.

Vvv-ILLniM J.V snnvin.

red that the specilica-t` 

